FIGURE 4 in A new species of Cirratulus (Annelida: Polychaeta) described from a shallow-water whale bone in Antarctica

FIGURE 4. Cirratulus balaenophilus sp. nov. SEM micrographs. A. Thoracic region; B. Detail of anterior region showing the general arrangement of dorsal tentacles and first branchiae; C. Anterior region showing the nuchal organ; D. Detail of the nuchal organ; E. Detail of splayed fibrils in the capillary chaeta from second notopodia. br, branchiae; dT, dorsal tentacle; nuO, nuchal organ; par, parapodia; per, peristomium; pr, prostomium.